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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 159-168页

作者： Hongyu Zheng Xin Gai Yun Bai wentao hou Shujun Li Yulin Hao R.D.K.Misra Rui Yang Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Nuclear Power Institute of China Chengdu610213China Department of Metallurgical Materialsand Biomedical EngineeringThe University of Texas at El Paso500WUniversity AvenueEl PasoTX79968USA

The electrochemical behavior of Ti-6Al-4V with 1 mm and 16 mm thickness prepared by electron beam powder bed fusion(EB-PBF)was investigated in phosphate buffered *** results showed that EB-PBF Ti-6Al-4V with a larger component size was more resistant to corrosion compared to the smaller component,because of less acicularαʹphase content and moreβphase *** a non-equilibrium phase in the“high-energy state”,αʹphase has a greater susceptibility to corrode and reduces the corrosion resistance of the material,whileβphase improves corrosion resistance of titanium *** results show that the phase composition has a more significant effect on the corrosion performance than the grain size.

关键词： Electron beam powder bed fusion Ti6Al4V alloy Corrosion resistance Component size Polarisation

超高温菌好氧堆肥技术对餐余垃圾中油脂、盐分的处理效果研究

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环境污染与防治 2024年第5期46卷 613-617,625页

作者：刘闯姜悦吴志博侯文涛沈阳建筑大学市政与环境工程学院辽宁沈阳110168

餐余垃圾高油高盐特征是影响其堆肥化效果的重要因素。从超高温环境下培养出以芽孢杆菌属(Bacillus)为核心的超高温菌群,考察超高温菌群对餐余垃圾好氧堆肥化过程中堆体温度、物料含水率、pH、种子发芽指数等的影响,并分析好氧堆肥化过... 详细信息

餐余垃圾高油高盐特征是影响其堆肥化效果的重要因素。从超高温环境下培养出以芽孢杆菌属(Bacillus)为核心的超高温菌群,考察超高温菌群对餐余垃圾好氧堆肥化过程中堆体温度、物料含水率、pH、种子发芽指数等的影响,并分析好氧堆肥化过程中微生物种群的变化。结果表明,添加超高温菌群后,餐余垃圾好氧堆肥化温度最高可达83℃,75℃以上温度可以维持6 d,含水率由50.23%下降至26.71%,油脂、盐分质量分数分别从1.94%、3.62%降低至0.15%、0.88%,降解率较未添加超高温菌群的对照组分别提升了15.30百分点、17.29百分点。芽孢杆菌属和芽孢八叠球菌属(Sporosarcina)是维持超高温的重要菌属,堆肥芽孢杆菌属(Compostibacillus)和芽孢八叠球菌属是提高油脂、盐分降解效率的重要菌属。超高温菌好氧堆肥化技术处理餐余垃圾相较于传统好氧堆肥化技术能有效提高餐余垃圾中油脂、盐分的降解效率,在一定程度上促进了相关菌种的生长,提高堆体腐熟程度。

关键词：超高温好氧堆肥化餐余垃圾油脂盐分微生物种群

Experimental study on expansion and cracking properties of static cracking agents in different assembly states

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International Journal of Mining Science and Technology 2022年第6期32卷 1259-1272页

作者： Chong Li Sifeng He wentao hou Dan Ma School of Mines China University of Mining and TechnologyXuzhou 221116JiangsuChina MOE Key Laboratory of Deep Coal Resource Mining China University of Mining and TechnologyXuzhou 221116JiangsuChina

Rolled static cracking agent(RSCA)can solve the intractable problem of traditional bulk static cracking agent(BSCA)in engineering *** paper innovatively studies the rational water-cement ratio of BSCA and the immersion soaking time of RSCA under the condition of controlling *** the expansion and cracking performance experiments,the development characteristics of expansion pressure,the cracking effect of the single-hole specimen and the performance of hole spraying prevention under the action of BSCA and RSCA were compared and *** results show that:(1)The volume growth rate of static cracking agent decreases with the increase of water-cement ratio,and the fluidity increases with the increase of water-cement *** rational water-cement ratio for BSCA application is 0.3,and the rational immersion time of RSCA is 2-2.5 min;(2)Under the bore diameters of 30,35,40 and 45 mm,the expansion pressure of BSCA with a water-cement ratio of 0.3 is 38.2,52.3,61.5 and 68 MPa,and the expansion pressure of RSCA immersed in water for 2.5 min is 43.5,58.8,69.5 and 75.1 MPa,*** them,the development speed of expansion pressure of BSCA is higher than that of RSCA,and the arrival time of the peak expansion pressure of RSCA is 1.7 times that of BSCA;(3)The crack initiation speed of single-hole specimen under the action of RSCA is 10.3%lower than that under the action of BSCA,but the cracking speed of the former is 72.6%higher than that of the latter;(4)The hole spraying occurs in BSCA under the bore diameter of 50,55 and 60 mm,while the hole spraying occurs in RSCA under the bore diameter of 60 *** terms of bore diameter,the hole spraying prevention of the RSCA is better than that of *** research results enrich the static blasting technology and provide data support and theoretical reference for field application.

关键词： Static cracking agent Water-cement ratio Static blasting Expansion pressure Hole spraying

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基于支持向量回归模型的混沌系统多步预测

江苏理工学院学报 2024年第4期30卷 119-125页

作者：赵晓乐侯文涛北方民族大学数学与信息科学学院宁夏银川750021 运城学院数学与信息技术学院山西运城044000

混沌时间序列具有不可预测性和类随机性等特性,会导致混沌时间序列的多步预测及其困难。文章探讨了基于支持向量回归模型的混沌时间序列递归多步预测理论及应用。首先,介绍了支持向量回归模型和混沌时间序列递归多步预测理论;然后,将该... 详细信息

混沌时间序列具有不可预测性和类随机性等特性,会导致混沌时间序列的多步预测及其困难。文章探讨了基于支持向量回归模型的混沌时间序列递归多步预测理论及应用。首先,介绍了支持向量回归模型和混沌时间序列递归多步预测理论;然后,将该理论分别应用于Logistic Map和太阳黑子混沌时间序列,并进行实证分析。结果表明,受累积误差的影响,预测步数越多,均方误差和归一化均方误差均越大,而R 2越小。Logistic Map递归可预测步数大概是14步,太阳黑子递归可预测步数大概是6步;最后,对后续的研究工作提出了几点思考意见。

关键词：混沌时间序列支持向量回归多步预测

煤-热协同开采导水断层岩体热-流-固耦合试验研究

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采矿与安全工程学报 2024年第2期41卷 352-361页

作者：马丹侯文涛孔赛博张吉雄李樯周楠高富强汪锋刘勇中国矿业大学矿业工程学院深部煤炭资源开采教育部重点实验室江苏徐州221116 广州市城市规划勘测设计研究院广东广州510060 山东科技大学能源与矿业工程学院山东青岛266590

导水断层岩体的高渗透性为煤炭-水热型地热能高效协同开采提供了新思路,研究深部热-流-固耦合条件下断层岩体的渗透性演变规律是实现煤-热协同开采的重要前提。自主研制了热-流-固耦合三轴试验系统,开展了导水断层岩体热-流-固耦合特性... 详细信息

导水断层岩体的高渗透性为煤炭-水热型地热能高效协同开采提供了新思路,研究深部热-流-固耦合条件下断层岩体的渗透性演变规律是实现煤-热协同开采的重要前提。自主研制了热-流-固耦合三轴试验系统,开展了导水断层岩体热-流-固耦合特性试验。试验结果表明,热-流-固耦合作用下破碎岩体的渗透过程可以划分为冲蚀增透阶段及体缩抑流阶段,其中,冲蚀增透阶段发生在试验初期,岩体的渗透性参数(孔隙率、流速及渗透率)在该阶段迅速增长,进入体缩抑流阶段后保持小幅波动。高温下岩石颗粒的热膨胀效应抑制了岩体孔隙空间扩展,导致渗透参数在冲蚀增透阶段增长缓慢;水压越高,渗透参数在冲蚀增透阶段增幅越大,表明高水压的冲蚀效应更显著;加载轴压与围压均会促进岩体的体缩效应,抑制渗透压力的冲蚀效果,导致试样渗透特性降低。文章丰富了导水断层岩体热-流-固耦合特性研究,为煤-热高效协同开采提供了试验基础。

关键词：煤-热协同开采断层岩体热-流-固耦合特性冲蚀效应

Longitudinal Compression Behavior of Functionally Graded Ti–6Al–4V Meshes

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Journal of Materials Science & Technology 2016年第11期32卷 1098-1104页

作者： Shangzhou Zhang Cong Li wentao hou Shuo Zhao Shujun Li School of Environmental and Materials Engineering Yantai University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

The compressive deformation behavior in the longitudinal direction of graded Ti–6Al–4V meshes fabricated by electron beam melting was investigated using experiments and finite element methods（FEM）.The results indicate that the overall strain along the longitudinal direction is the sum of the net strain carried by each uniform mesh constituent and the deformation behavior fits the Reuss model well. The layer thickness and the sectional area have no effect on the elastic modulus, whereas the strength increases with the sectional area due to the edge effect of each uniform mesh constituent. By optimizing3 D graded/gradient design, meshes with balanced superior properties, such as high strength, energy absorption and low elastic modulus, can be fabricated by electron beam melting.

关键词： Graded Ti–6Al–4V meshes Electron beam melting Reuss model Compressive deformation Edge effect

Mechanical and hydraulic properties of fault rocks under multi‑stage cyclic loading and unloading

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International Journal of Coal Science & Technology 2023年第4期10卷 151-170页

作者： wentao hou Dan Ma Qiang Li Jixiong Zhang Yong Liu Chenyao Zhou School of Mines China University of Mining&TechnologyXuzhou 221116JiangsuChina State Key Laboratory of Coal Resources&Safe Mining China University of Mining&TechnologyXuzhou 221116JiangsuChina MOE Key Laboratory of Deep Coal Resource Mining China University of Mining&TechnologyXuzhou 221116JiangsuChina

The rock mass in fault zones is frequently subjected to cyclic loading and unloading during deep resource exploitation and tunnel *** on the mechanical and hydraulic characteristics of fault rock during the cyclic loading and unloading is of great signifcance for revealing the formation mechanism of water-conducting pathways in fault and preventing water inrush *** this study,the mechanical and seepage tests of fault rock under the multi-stage cyclic loading and unloading of axial compression were carried out by using the fuid–solid coupling triaxial experimental *** hysteresis loop of the stress–strain curve,peak strain rate,secant Young's modulus,and permeability of fault rock were obtained,and the evolution law of the dissipated energy of fault rock with the cyclic number of load and unloading was *** experimental results show that with an increase in the cyclic number of loading and unloading,several changes *** hysteresis loop of the stress–strain curve of the fault rock shifts towards higher levels of ***,both the peak strain rate and the secant Young's modulus of the fault rock increase,resulting in an increase in the secant Young's modulus of the fault rock ***,the growth rate of the secant Young's modulus gradually slows down with the increase of cyclic number of loading and *** permeability evolution of fault rock under the multi-stage cyclic loading and unloading of axial compression can be divided into three stages:steady increase stage,cyclic decrease stage,and rapid increase ***,the calculation model of dissipated energy of fault rock considering the efective stress was *** calculation results show that the relationship between the dissipated energy of fault rock and the cyclic number of loading and unloading conforms to an exponential function.

关键词： Multi-stage cyclic loading and unloading Fault rocks Mechanical properties Hydraulic properties Energy dissipation

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基于深度学习的腰椎间盘退变全自动分级

中国临床研究 2024年第5期37卷 709-713页

作者：丁兆明李鸿燕陈亮陈兵孙辉候文韬夏春华安徽医科大学第三附属医院影像中心安徽合肥230000 中国科学技术大学安徽合肥230000 安徽医科大学安徽合肥230000

目的探讨深度学习模型在腰椎磁共振T2加权成像(T2WI)矢状图像上全自动识别腰椎间盘退变程度的可行性。方法回顾性抽取2020年8月至2022年6月于安徽医科大学第三附属医院就诊并行腰椎MRI检查的94例患者的腰椎T2WI图像数据,共获得466个椎间... 详细信息

目的探讨深度学习模型在腰椎磁共振T2加权成像(T2WI)矢状图像上全自动识别腰椎间盘退变程度的可行性。方法回顾性抽取2020年8月至2022年6月于安徽医科大学第三附属医院就诊并行腰椎MRI检查的94例患者的腰椎T2WI图像数据,共获得466个椎间盘,由两名放射科医生手动标注腰椎间盘,将数据随机分为训练集(300个)、调优集(72个)和测试集(94个),首先使用U-Net网络训练椎间盘分割模型,模型评价指标包括Dice系数和交并比(IoU)分数;然后利用SpineNet网络训练分类模型进行评价,评价指标包括准确度、敏感度、特异度、F1分数及ROC曲线。结果测试集中U-Net模型对腰椎间盘分割的平均Dice系数值及IoU分数分别为0.920、0.853;SpineNet分类模型对腰椎间盘退变分类诊断的准确度、特异度、敏感度分别为0.913、0.912、0.916,ROC曲线分析示,该模型区分腰椎间盘退变轻度vs中度、轻度vs重度、中度vs重度的AUC值分别为0.89、0.95、0.90。结论深度学习网络对腰椎间盘退变程度的全自动分类是可行的。

关键词：腰椎椎间盘退变深度学习网络 T2WI矢状图像 U-Net模型分割模型分类模型

Heat treatment enhancing the compressive fatigue properties of open-cellular Ti-6Al-4V alloy prototypes fabricated by electron beam melting

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Journal of Materials Science & Technology 2018年第7期34卷 1127-1131页

作者： Wei Yuan wentao hou Shujun Li Yulin Hao Rui Yang Lai-Chang Zhang Yue Zhu Department of Orthopedics First Hospital of China Medical University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Engineering Edith Cowan University

In this work, we report the effect of annealing in α＋β phase field on the fatigue properties of Ti-6A1-4V alloy meshes fabricated by electron beam melting. The results show that annealing at high temperature near the phase boundary enhances the ductility of the brittle mesh struts due to the formation of coarse α lamellas with a large thickness/length ratio. Accordingly, the fatigue endurance ratio of the studied meshes increases to up to -0.6, which is much superior to that of the as-fabricated counterparts and comparable to those of dense materials.2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Titanium alloy Reticulated mesh Annealing treatment Morphology Fatigue endurance

Fatigue properties of titanium alloy custom short stems fabricated by electron beam melting

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Journal of Materials Science & Technology 2020年第17期52卷 180-188页

作者： Liao Wang Shujun Li Mengning Yan Yubo Cheng wentao hou Yiping Wang Songtao Ai Rui Yang Kerong Dai Shanghai Key Laboratory of Orthopaedic Implants Department of Orthopaedic SurgeryShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai Jiao Tong UniversityShanghai 200030China Titanium Alloy Laboratory Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Image Medraw Technology(Shanghai)Company Limited Shanghai 201100China

The fatigue properties of titanium alloy short-stems with four different lengths,manufactured by electron beam melting(EBM)technology,were investigated by in vitro test and finite element(FE)*** simulation results indicate that the maximum tensile stress concentrates at the lateral side of the stem *** magnitude of the concentrated tensile stress increases and the corresponding area of the axial section decreases with increasing of stem *** from fatigue tests demonstrate that fatigue cracks mainly initiate from the rough surface of the stem where the maximum tensile stress *** fatigue strength decreases with the increase of stem length,which is attributed to the higher stress concentration on the longer stem *** addition,it is found that post EBM treatment via hot isostatic processing(HIP)is able to enhance the fatigue properties of the stems,since the pores generated during EBM are mostly closed during *** work also demonstrates that the stress concentration on the stem surface can be effectively mitigated and the corresponding fatigue properties of the EBM-fabricated titanium alloy short stem can be considerably improved by optimizing the design in the stem length.

关键词： Custom short stem Titanium alloy Electron beam melting Fatigue property